University of Technology Sydney, Centre for Forensic Science, PO Box 123, Broadway, NSW 2007, Australia.
University of Technology Sydney, Centre for Forensic Science, PO Box 123, Broadway, NSW 2007, Australia.
Forensic Sci Int. 2020 Sep;314:110411. doi: 10.1016/j.forsciint.2020.110411. Epub 2020 Jul 13.
Fingermark detection is in constant evolution, with new techniques being developed and existing ones being continuously optimised. Recently, researchers have begun to express interest in artificial fingermark secretions to overcome the issues arising from the variability of fingermark composition. Some of these artificial secretions have started to appear on the market in the form of pads that can be used to deposit fingermarks with a known and controlled composition. This study aimed at assessing the reliability of three commercially-available pads by comparing the results to those obtained by real fingermarks, using six detection techniques (1,2-indanedione/zinc, ninhydrin, cyanoacrylate followed by rhodamine 6G staining, gold/zinc vacuum metal deposition, and physical developer) on five substrate types (copy and recycled paper, acetate, glass, and glossy paper). The results showed that the artificial fingermarks deposited with these pads reacted in an unreliable way, notably when treated with complex detection techniques such as Physical Developer. Further, the high concentration of some of the target compounds found in the artificial secretion led to an over performance of some detection techniques, which could mislead the operator to overestimating the efficiency of a given method. The resulting artificial fingermarks are considered too dissimilar to real fingermarks to be used as quality control standards and better simulants need to be found for a more efficient and realistic control of the variability.
指纹检测技术不断发展，新的技术不断涌现，现有的技术也在不断优化。最近，研究人员开始对人工指纹分泌物产生兴趣，以克服指纹成分变化带来的问题。其中一些人工分泌物已经以垫的形式出现在市场上，可以用来沉积具有已知和可控成分的指纹。本研究旨在通过使用六种检测技术（1,2-茚二酮/锌、邻苯二醛、氰基丙烯酸酯随后用罗丹明 6G 染色、金/锌真空金属沉积和物理显影剂）在五种基质类型（复印纸和再生纸、醋酸纤维素、玻璃和光面纸）上，比较实际指纹和三种市售垫沉积的人工指纹的结果，评估三种市售垫的可靠性。结果表明，这些垫沉积的人工指纹反应不可靠，特别是在用物理显影剂等复杂检测技术处理时。此外，人工分泌物中一些目标化合物的高浓度导致某些检测技术的过度表现，这可能会误导操作人员高估给定方法的效率。因此，这些人工指纹与真实指纹差异太大，不能用作质量控制标准，需要找到更好的模拟物，以更有效地控制指纹成分的变化。
